How to Diagnose Catalytic Converters Flashing check engine light, codes p0420 or p0430, rough running, bad acceleration, or stinky smelling exhaust are all indications that there is a problem with the catalytic converter in your car or truck. But what is the problem? What does the catalyst do? In this video, Andy shows you, and offers some tips and suggestions for what you can do to handle a problematic catalytic converter. #1aauto #autorepair #autorepairtips #catalyticconverter #p0420 #P0430 |